A. Dumas  wrote:
> More or less impossible. E.g. apparently you didn't think that + is a
> valid character, which it is (in the part before the @). Also, domains
> (and usernames) can be UTF8. Best way is: try to deliver, check reply.

It's extremely hard, but some people have tried:

https://emailregex.com/
https://stackoverflow.com/questions/201323/how-to-validate-an-email-address-usi
ng-a-regular-expression

Definitely not a thing to make up yourself, you'll almost certainly get it
wrong.

Theo

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